US2909454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing core-plated electrical steel strip
Assignee: United States Steel Corp
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Filing: 1957-12-04
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Granted: 1959-10-20
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Expires: 1977-12-04
Abstract
No abstract record available.
Inventors
- 👤 Richard A Neish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:52
CPC Classifications
C; C23; C23C; C23C26/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF PRODUCING CORE-PLATED ELECTRICAL STEEL STRIP CHARACTERIZED BY BEING STRESS-RELIEF ANNEALABLE IN REDUCING ATMOSPHERES WITHOUT LOSS OF ELECTRICAL PROPERTIES INCLUDING FORMING A SILICON STEEL STRIP, TREATING SAID STRIP TO PRODUCE A THIN ADHERENT FILM OF MAGNESIA AND SILICA ON THE SURFACES THEREOF, COATING THE TREATED WITH AN AQUEOUS SOLUTION OF CHROMIC OXIDE AND MAGNESIUM OXIDE AND THEN HEATING THE STRIP TO A TEMPERATURE ABOVE 700*F. IN A REDUCING ATMOSPHERE TO CURE SAID COATING AND PRODUCE A SPINEL-LIKE CORE-PLATE HAVING A HIGH DEGREE OF ELECTRICAL RESISTANCE COMBINED WITH GOOD SPACE FACTOR.
Claim 2
Independent Claim
92 words
A METHOD OF PRODUCING CORE-PLATED ELECTRICAL STEEL STRIP CHARACTERIZED BY BEING STRESS-RELIEF ANNEALABLE IN REDUCING ATMOSPHERES WITHOUT LOSS OF ELECTRICAL PROPERTIES INCLUDING FORMING A SILICON STEEL STRIP, TREATING SAID STRIP TO PRODUCE A THIN ADHERENT FILM OF MAGNESIA AND SILICA ON THE SURFACES THEREOF, COATING THE TREATED WITH AN AQUEOUS SOLUTION OF CHROMIC OXIDE AND MAGNESIUM OXIDE AND THEN HEATING THE STRIP TO A TEMPERATURE ABOVE 700*F. IN A REDUCING ATMOSPHERE TO CURE SAID COATING AND PRODUCE A SPINEL-LIKE CORE-PLATE HAVING A HIGH DEGREE OF ELECTRICAL RESISTANCE COMBINED WITH GOOD SPACE FACTOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |